Chalkboard Script writes your word onto slate in handwritten chalk, with the line's edges breaking up the way chalk does on a rough surface and dust falling away beneath as it is drawn.
drawChalk animates stroke-dashoffset along the handwriting path while feTurbulence and feDisplacementMap roughen the stroke edges — that irregularity is what makes it chalk rather than a white line. chalkWobble adds a slight unsteadiness and dustFall drops particles as the stroke passes.
It will read as an outline rather than chalk. The style depends on light marks on a dark rough surface, which is why the slate is part of the design.